3. Results and discussion
3.1. Oxidation of bulk oils at different relative humidity
Effects of relative humidity on the headspace oxygen content, CDA, and moisture content in stripped corn oils at 60 °C are shown in Fig. 2. Headspace oxygen content in samples stored at 60 °C was significantly influenced by RH (p < 0.05) although the oxidative stability in stripped bulk oils was not proportionally dependent on relative humidity. Samples with SC (the 75% RH environment) had the lowest headspace oxygen content whereas those with LC and MC environment (11% and 32% RH, respectively) had the highest headspace oxygen content (p < 0.05). Samples with very low RH such as PP had lower headspace oxygen content than those with LC and MC. Also, samples at very high RH such as PN (93%) had significantly higher headspace oxygen content than those at SC (p < 0.05), resulting in a trend of a “N”-shape from PP to PN samples ( Fig. 2a).